Advent of Groovy code, day 9

Advent9.groovy

// see challenge here: http://adventofcode.com/2017/day/9

String input = /your input here/

String collapseEscape  = input.replaceAll(/!./,'')
String collapseGarbage = collapseEscape.replaceAll(/<.*?>/,'')

String listString = collapseGarbage.tr('{}','[]')
String normCode   = listString.replaceAll(/\[,/,'[')

def roseTree = evaluate(normCode)

def dfsVisit(node, Integer depth, Closure todo) {
    todo(depth) // could be fused but I like the separation
    for (child in node) { dfsVisit child, depth+1, todo}
}

def result = 0
dfsVisit(roseTree, 1) { depth -> result += depth }
println result

Doesn't work for input of: String input = {garbage, garbage, garbage,garbage}
Changing String normCode = listString.replaceAll(/[,/,'[')
to String normCode = listString.replaceAll(/[,*+/,'[') works

I love your frege examples, btw.

thanks for the comment and the kind words!